I would advocate that any such comments be visible only after the player has completed (or given up on) the puzzle. Getting warnings about confusing clues while working on the puzzle, to my way of thinking, somewhat invalidates the competition aspect of the site.

Or, have it be like the help feature. If you access the comments before finishing the puzzle, the puzzle will not be counted in your win totals.

Yes, comments will definitely be a "post-game" feature only - a way for players to share their triumphs and frustrations, and point out any possible problems in the puzzle so that I can jump in and fix 'em. :-)

Here's an example: I just finished a puzzle with the following names: Danica, Haley, Hayley, Kaylie & Tiffany. That was a real challenge getting the correct column while reading those names sideways!
That did force me to be careful, which I'll admit that if I did every time, I could get them right the first time & end up with a higher score.

But I do enjoy these puzzles. I see more categories showing up lately. Thanks for the work you've put into this site.

Also, thanks for linking to ieSpell. That's been useful for other forums & applications.